I also use steam to clean mine but I put a wt sponge or dishcloth in the microwave on high for two minutes and then leave it in there for several minutes more to cool down before using it to clean the inside of the oven. This is great for all the little splatters that hit the ceiling and sides.

I agree! Steam power that naturally builds up in your micorwave when you heat up a cup of water is absolutely the best way to clean a grungy microwave oven. I like adding a squirt of fresh lemon juice, a bit of vinegar, or a sprinkle of baking soda.